Naval Brass, Uninhibited UNS-C46400

Naval Brass, Uninhibited  UNS-C46400

Naval Brass is a 60:40 copper zinc alloy to which about 1% of tin has been added to improve the corrosion resistance, particularly to dezincification. The alloy is a two phase alpha-beta brass, hence has reasonably high strength with lower ductility than the single phase 70:30 or alpha brass. It is used for structural applications and for forgings, especially where contact with sea water is likely to induce corrosion. The mechanical properties are almost indistinguishable from those of 60:40 brass C28000, although the tin addition tends to give slightly higher strength.

C46400 can be readily hot worked, and can also be cold worked, but not as easily as the single phase alpha brasses.

Chemical Composition

(% maximum, unless shown as range or minimum)
Copper Iron Lead Tin Zinc
Min/Max
59.0-62.0
0.10
0.20
0.50-1.00
Remainder
Nominal
60.0
0.7
39.2
Copper + Sum of Named Elements, 99.6% minimum

Applicable Specifications

Product Specifications
AMS ASME ASTM Federal Military SAE
Bar
4611, 4612
B21
QQ-B-639
J461, J463
Bar, Forging
B124
Bolts
F468
Forgings, Die
B283
Nuts
F467
Plate
QQ-B-639
Plate, Clad
B432
Plate, Condenser Tube
SB171
B171
Rod
4611, 4612
B21
J461, 463
Rod, Forging
B124
Screws
F468
Shapes
B21
Shapes, Forging
B124
Sheet
QQ-B-639
Strip
QQ-B-639
J461, J463
Studs
F468
Wire, Metallizing
MIL-W-6712
Room Temperature, 20°C
Temper
Section Size
Cold Work
Temperature
Tensile Strength
Yield Strength(0.5% ext under load) Elongation Rockwell Hardness
Vickers Hardness
Shear Strength
mm
%
°C
MPa
MPa
% B C F 30T 0.5 MPa
Flat Products
H01
1
0
20
483
400
17
75
68
138
296
M20
25.4
0
20
379
172
50
55
55
99
276
O50
1
0
20
427
207
40
60
57
107
283
O50
6.35
0
20
414
193
45
58
56
104
283
O60
6.35
0
20
400
172
49
56
55
100
276
Rod
H01
6.35
10
20
483
331
25
80
150
296
H01
25.4
8
20
476
317
27
78
146
296
H01
51
8
20
462
276
35
75
138
296
H02
6.35
20
20
552
393
20
85
164
310
H02
25.4
20
20
517
365
20
82
156
303
O50
6.35
0
20
434
207
40
60
107
290
O50
25.4
0
20
434
207
40
60
107
290
O50
51
0
20
427
193
43
60
170
290
O60
6.35
0
20
400
186
45
56
100
276
O60
25.4
0
20
393
172
47
55
99
276
O60
51
0
20
386
172
47
55
99
276
Tube
H80
0.0
35
20
607
455
18
95
200

Mechanical Properties

Common Fabrication Processes

Blanking, Drawing, Forming and Bending, Heading and Upsetting, Hot Forging and Pressing, Hot Heading and Upsetting, Shearing


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